DPI与PPI
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定义
DPI（每英寸点数）衡量打印输出分辨率；PPI（每英寸像素数）衡量屏幕显示分辨率——两者都描述图像元素的空间密度。
解释
Print at 300 DPI is considered photo quality; newspaper print runs at 85–150 DPI. Apple coined 'Retina display' for screens above ~300 PPI, where individual pixels become imperceptible at normal viewing distance. The iPhone 15 Pro screen is 460 PPI. Confusingly, 'DPI' is widely misused to mean PPI in software settings—they are conceptually distinct but numerically interchangeable in digital-to-print workflows.
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